Patents
Patents for H04B 1 - Details of transmission systems, not covered by a single one of groups; Details of transmission systems not characterised by the medium used for transmission (188,568)
01/1989
01/25/1989CN1030647A Identification system for stock farms
01/24/1989US4800390 Adaptive antenna arrays for frequency hopped systems
01/24/1989CA1249344A1 Radio receiver for carrying out self diagnosis without interference
01/24/1989CA1249342A1 Optical repeater and regulated current feeding system for the same
01/19/1989DE3722241A1 Method for transmitting a monophonic broadcast signal
01/18/1989EP0299557A1 Identification system for stock farms
01/18/1989EP0299162A2 Multiple built-in connector
01/18/1989EP0298959A1 Fm receiver with noise suppression during rayleigh faded received signals.
01/18/1989CN2031181U High anti-interference multi-purpose remote control receiver
01/18/1989CN2031180U Micro computer voice-frequency processer
01/18/1989CN1030506A Telephone transmitter-receiver set capable of operating handset by wireless system
01/17/1989US4799237 Channel-system exchange system for digital data radio-communication system
01/17/1989US4799214 Two-wire full duplex frequency division multiplex modem system having echo cancellation means
01/17/1989US4799066 Impedance matching arrangement
01/17/1989US4799063 Method and apparatus for isolating faults in an antenna system
01/17/1989US4799062 Radio position determination method and apparatus
01/17/1989US4799035 Microwave diode tuning circuit
01/17/1989US4799029 Saw oscillator with attenuator for protecting saw element
01/17/1989US4798982 Active symmetrical balance hybrid circuit
01/12/1989DE3720400C1 Audion circuit for radio time signal receivers
01/11/1989EP0298759A2 Housing and holder assembly for a portable communication apparatus
01/11/1989EP0298720A2 Housing structure for paging receiver
01/10/1989US4797950 Multipath reduction system
01/10/1989US4797903 Channel switching system without instantaneous signal loss
01/10/1989US4797844 Digital mixing apparatus which attenuates the sum frequency of the mixed signals
01/10/1989CA1248593A1 Squelch detecting circuit with squelch start determining means
01/10/1989CA1248591A1 Battery-powered mobile communications apparatus having transmitter reset function
01/10/1989CA1248589A1 Mobile radio telephone
01/04/1989EP0297688A1 Electronic identification system
01/04/1989EP0297403A2 Method for transmitting and/or recording and playing back digitized audio signals
01/04/1989CN1030162A Orthogonal-polarization duplex send-receive microwave head
01/03/1989US4796296 PCM coder and decoder having function of two-wire/four-wire conversion
01/03/1989US4796213 Method of filtering signals for a controller of a turbo compressor
01/03/1989CA1248234A1 Frequency domain speech coding
12/1988
12/29/1988WO1988010548A1 Low power digital receiver
12/29/1988WO1988010539A1 Apparatus for achieving a controllable line termination impedance
12/28/1988EP0296838A2 Monolithic microwave transmitter/receiver
12/28/1988CN87101067A Earplug type miniature radio cassette recorder
12/27/1988US4794649 Radio communication system with power saving disablement prior to call handling processes
12/27/1988US4794622 Low power transmitter frequency stabilization
12/27/1988US4794489 Portable radio transceiver housing structurally supported by a battery
12/21/1988EP0295973A1 Noise reduction arrangement for ultra-high frequency amplifier and amplifier-antenna connection including such an arrangement
12/21/1988EP0295688A1 Microwave primary emitting-receiving duplexer-unit for orthogonaly polarised waves
12/21/1988EP0295373A2 Computerized mobile two-way radio system with serial interface
12/21/1988CN88202578U Radio transmitter for low-resistance sound signal
12/21/1988CN88102082A Filtering apparatus of fm ultrashort wave receiving signal
12/21/1988CN87216712U Infrared acoustic frequency signal sending machme
12/21/1988CN87103908A Dynamic antenna tuning system and method
12/20/1988US4792994 Radio equipped thermos
12/20/1988US4792992 Radio receiver
12/20/1988US4792991 FM receiver having improved audio quality in response to Rayleigh faded received signals
12/20/1988US4792987 Antenna coupling amplifier and converter system
12/20/1988US4792986 Portable radio system with externally programmable universal device connector
12/20/1988US4792939 Duplex radio communication transceiver
12/20/1988CA1247266A1 Wireless telephone system
12/20/1988CA1247206A1 Protection switching system for carrier transmission line
12/20/1988CA1247199A2 Retainer for radio receiver
12/15/1988WO1988010045A1 Adaptive frequency modulation
12/15/1988WO1988010035A1 Protection of energy information in sub-band coding
12/15/1988WO1988010033A1 Dual port fm demodulation in phase locked receivers
12/15/1988WO1988009967A1 Method for error correction in digitally encoded speech
12/15/1988DE3717009A1 Radio unit for a mobile radio system
12/14/1988EP0295146A2 Supervised, interactive alarm reporting system
12/14/1988EP0294570A2 Extrema coder employing noisy limiting amplifier stages
12/14/1988CN87103672A Scanning receiver for nationwide radio paging system
12/13/1988US4790417 Brief case with a portable wireless telephone
12/13/1988CA1246735A1 Antenna circuit
12/13/1988CA1246708A1 Transceiver with auto frequency sense
12/07/1988EP0293873A2 A signal distinction circuit
12/07/1988EP0293828A2 Circuit device for demodulating DSB modulated signals and method therefor
12/07/1988EP0293464A1 Process for transmitting and/or evaluating on the receiver side information inside a radio signal.
12/07/1988CN87101170A Millimeter wave wide-band direct-frequency modulator
12/06/1988US4790030 Tuner with insertable antenna coupler
12/06/1988US4790015 Multirate digital transmission method and device for implementing said method
12/06/1988US4789897 Frequency converting apparatus for converting an RF television signal to a video signal employing low IF techniques
12/06/1988CA1246254A1 System for improving signal-to-noise ratio in a direct sequence spread spectrum signal receiver
12/06/1988CA1246151A1 Autodyne receiver
12/06/1988CA1246150A1 Noise blanking signal generator for am radio
12/01/1988WO1988009571A1 Apparatus for electrically connecting two audio components utilizing different sized conductors
12/01/1988DE3816462A1 Method for transmitting signals via a narrowband channel
11/1988
11/30/1988EP0293287A1 Spread spectrum phase demodulator test system
11/30/1988EP0293197A2 A multi-drop type bus line system
11/30/1988EP0293099A1 Microwave landing system with fail-soft switching of dual transmitters, beam steering and sector antennas
11/30/1988EP0293039A1 Bipolar transistor amplifier
11/30/1988EP0292996A2 Digital two-way radiocommunication system using single frequency
11/30/1988CN87103474A Cable wire-distinguishing equipment
11/29/1988US4788543 Apparatus and method for broadcasting priority rated messages on a radio communications channel of a multiple transceiver system
11/29/1988US4788513 Remanent subcarrier component suppressing device for balanced modulator
11/29/1988US4787862 Apparatus for electrically connecting two audio components utilizing different sized conductors
11/29/1988CA1245781A1 Timing signal correction system for use in direct sequence spread spectrum signal receiver
11/29/1988CA1245780A1 Method of reconstructing lost data in a digital voice transmission system and transmission system using said method
11/24/1988DE3721918C1 Method for evaluating the suitability for reception of the frequency-modulated broadcast transmissions received in an FM broadcast receiver, and circuit arrangement for carrying out the method
11/24/1988DE3715901A1 Generator for feeding an ELF antenna
11/23/1988EP0291935A2 FMX stereophonic broadcast receiver
11/23/1988EP0291827A2 Dar radio with an electronic antitheft device
11/23/1988CN88100919A Fm/fmx stereophonic receiver
11/23/1988CN88100369A Fmx stereophonic receiver
11/23/1988CN87103366A Wireless data transmitter
11/22/1988CA1245356A1 Data network interface module
11/22/1988CA1245354A1 Adaptive antenna array